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adityatan's picture

Coloring Problem GL.Color3

Posted Friday, 20 August, 2010 - 02:40 by adityatan in

Hi there:

I have a problem in coloring my mesh. Here's a piece of my code. The OpenTK setup has been done successfully.

        List<double> red1 = new List<double>();
 
        List<double> green1 = new List<double>();
 
            for (int i = 0; i < a.Mesh.ElementConnectivityList.Count(); i++)
            {
                GL.Color3(red1.ElementAt(i), green1.ElementAt(i), 0.0f);
                GL.Begin(BeginMode.TriangleFan);
                GL.Vertex3(elementConnectivity0.ElementAt(i));
                GL.Vertex3(tempSideTriangleA.ElementAt(i));
                GL.Vertex3(tempMidTriangleP.ElementAt(i));
                GL.Vertex3(tempSideTriangleB.ElementAt(i));
                GL.Vertex3(tempMidTriangleR.ElementAt(i));
                GL.Vertex3(tempSideTriangleD.ElementAt(i));
                GL.Vertex3(tempMidTriangleQ.ElementAt(i));
                GL.Vertex3(tempSideTriangleA.ElementAt(i));
                GL.End();
            }

Here's the first three values of red1: [0] = 103.41385656142761, [1] = 110.80128724674469, [2] = 29.120187397654238
Here's the first three values of green1: [0] = 151.58614343857238, [1] = 144.19871275325531, [2] = 225.87981260234577

It's weird how my triangle strips are all yellow. It's not supposed to be yellow--those R-G-B values does not indicate 255, 255, 0 !

Please help. Thank you.

Regards,

Aditya Tan

‹ Save a openGL rendering with transparency Creating a texture array ›

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c2woody's picture

Re: Coloring Problem GL.Color3

Posted Friday, 20 August, 2010 - 06:58 by c2woody

The OpenGL specs are quite explicit about the floating point ranges for glColor,
see http://www.opengl.org/sdk/docs/man/xhtml/glColor.xml

hannesh's picture

Re: Coloring Problem GL.Color3

Posted Friday, 20 August, 2010 - 11:24 by hannesh

Colors defined as floats (or doubles in your case) should be in the range of [0, 1]. Unless you would be using HDR, all of your colors should be within that range.